单选题 I'm exhausted; I ______ too much work to do these days.
A. had B. having
C. have D. am having

【正确答案】 C
【答案解析】[解析] 通过these days(这些天,最近)可知“要做的事太多了”是现在的状态,因此动词的时态应该是现在时。动词have表现状态的时候不能用进行时。